Poly Met Hrf Dam

St. Louis, Minnesota· Earth· 111 ft tall
Significant Hazard Tailings Private

Physical Details

Dam Height 111 ft (taller than 99.6% in MN)
Dam Length950 ft
Dam TypeEarth
Surface Area97 acres
NID IDMN01800

Safety Information

Significant Hazard

No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities

Emergency Action Plan: No
Last Inspection: February 9, 2023
State Regulated: No
Regulatory Agency: MNDNR EWR

Ownership

Poly Met Mining, Inc.

Private

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Frequently Asked Questions

What is the hazard classification of Poly Met Hrf Dam?

Poly Met Hrf Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.

Who owns Poly Met Hrf Dam?

Poly Met Hrf Dam is owned by Poly Met Mining, Inc. (Private).

When was Poly Met Hrf Dam last inspected?

Poly Met Hrf Dam was last inspected on February 9, 2023.

Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.